ISBN 9786054735846

M. ÖZTÜRK et al./ ISEM2016 Alanya – Turkey
of the lands that belong to the capability classes up to VIII, and that are able to be used for forest,
pasture and recreation are particularly located at the higher and mountainous parts of the watershed.
Furthermore, more than half of the watershed belong to the land capability class of VII. Brown
forest soils and grey-brown podsolic soils [21] have formed on sandstone-mudstone formation in
particular [22]. These two soil groups cover approximately 80% of the watershed [21]. The
remaining lands are covered by red-yellow podsolic soils, alluvial and colluvial soils respectively
[21]. More than half of the watershed has the shallow soils with the depth ranging between 20 cm
and 50 cm. Limestones and vulcanite-sedimentary rocks are the second and third major geological
formations after the sandstone-mudstone formation within the watershed [22].
According to the 30 years (between 1982 and 2011) of meteorological data based on the
measurements of meteorological station in the city center of Bartın Province, the average annual
total precipitation is 1033 mm whereas the average annual temperature is 12.6°C [23]. The region
drops into the humid mesothermal climate regime [24]. Nominately, October is the wettest month
with the 123 mm mean monthly total precipitation. May is the driest month with the 49 mm mean
monthly total precipitation [23]. The warmest month is July with the mean monthly temperature of
22.2°C. On the other hand, the coldest month is January with the mean monthly temperature of
4.1°C [23]. Dependent upon the blowing durations, the dominant winds are from westernnorthwestern
and north-northeastern directions where Black Sea is located [23].
Table 1. Based on slope degree ranges and soil depth, land use suitability classification for actual agricultural areas
2.2. Method
Slope
Degree
Ranges
Soil Depth Categories
Suitability
Class
0-5° 50> cm Moderate and Deep 1
0-5° 50< cm Shallow and Too Shallow 2
5-10° 50> cm Moderate and Deep 3
5-10° 50< cm Shallow and Too Shallow 4
10-15° 50> cm Moderate and Deep 5
10-15° 50< cm Shallow and Too Shallow 6
15-20° 50> cm Moderate and Deep 7
15-20° 50< cm Shallow and Too Shallow 8
20-25° 50> cm Moderate and Deep 9
20-25° 50< cm Shallow and Too Shallow 10
The slope degree and soil depth parameters were referred for the land use suitability analysis of the
actual agricultural areas in Bartın stream watershed (Table 1). Although the slope degree extends
up to values higher than 30° within the watershed, the areas steeper than 25° were not included into
the land use suitability classification. Because, the agricultural areas do not exist at these steeper
areas. Initially, the slope degrees between 0° and 25° were categorized into 5° ranges (Figure 2).
The areas with 0° to 5° slope were assumed as relatively plane (Table 1). In some places particularly
close to the stream and tributary channels, the depth of the soil reaches down to the levels lower
than -90 cm (Figure 3). The soil depth was grouped under “impervious (0 cm)”, “too shallow (0-
20 cm)”, “shallow (20-50 cm)”, “moderate deep (50-90 cm)” and deep (90+ cm)” (Figure 3). In
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